Variável RV Tauri

Variáveis RV Tauri são estrelas variáveis supergigantes que exibem mudanças em luminosidade ligadas a pulsações radiais de suas superfícies. Essas mudanças de luminosidade estão correlacionadas com mudanças em sua classificação estelar. Quando estão no momento de maior luminosidade, são estrelas da classe espectral F ou G, e quando estão no momento de menor brilho, são estrelas da classe K ou M.

O período das flutuações de luminosidade pode variar de 30 a 150 dias e exibem momentos de mínimos primários e secundários, diferentes uns dos outros. A diferença entre os máximos e mínimos pode alcançar quatro graus de magnitude aparente. São classificados em duas subclasses:

  • Variáveis RVa, cujo brilho médio não muda em relação ao tempo e;
  • Variáveis RVb, que mostram uma variação periódica, costumeiramente com um período de 600 a 1500 dias, de seu brilho médio.

O protótipo dessas estrelas variáveis, a estrela RV Tauri, é uma estrela variável da classe RVb, com magnitude aparente de +9,8 em seu máximo brilho, e +13,3 em seu mínimo. O período da flutuação de sua luminosidade é de 78,7 dias.

Estrelas variáveis RV Tauri são objetos pós-AGB (ramo gigante assintótico - nebulosas protoplanetárias). Acredita-se que a maior parte dessas estrelas variáveis são binárias, com a matéria interestelar confinada em um disco.[1]

Membros mais brilhantes

São conhecidos pouco mais de 100 estrelas variáveis RV Tauri,[2] e as mais brilhantes são listadas abaixo.[3]

Estrela
 Magnitude apr.
(máximo) 		Magnitude apr.
(mínimo) 		Período
(em dias)
 Distância[1]
(em parsecs) 		Luminosidade[1]
(Sol = 1)
R Sct 4,2 8,6 140,2 750 ± 290 9400 ± 7100
U Mon 5,1 7,1 92,26 770 ± 280 3800 ± 2700
AC Her 6,4 8,7 75,4619 1130 ± 390 2400 ± 1600
V Vul 8,1 9,4 75,72
AR Sgr 8,1 12,5 87,87
SS Gem 8,3 9,7 89,31
R Sge 8,5 10,5 70,594
AI Sco 8,5 11,7 71,0
TX Oph 8,8 11,1 135
RV Tau 8,8 12,3 76,698 2170 ± 720 3700 ± 2600
UZ Oph 9,2 11,8 87,44
TW Cam 9,4 10,5 85,6 3100 ± 1100 3700 ± 2600
TT Oph 9,4 11,2 61,08
UY CMa 9,8 11,8 113,9 8400 ± 3100 4500 ± 3300
DF Cyg 9,8 14,2 49,8080
CT Ori 9,9 11,2 135,52
SU Gem 9,9 12,2 50,12 2110 ± 660 1200 ± 770

Referências

  1. ↑ a b c Ruyter, S; Winckel; Dominik; Waters; Dejonghe (2005). «Strong dust processing in circumstellar discs around 6 RV Tauri stars. Are dusty RV Tauri stars all binaries?». Astronomy and Astrophysics. 435 (1): 161–166. Bibcode:2005A&A...435..161D. arXiv:astro-ph/0503290v1Acessível livremente. doi:10.1051/0004-6361:20041989 
  2. ↑ «GCVS Variability Types». General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. 12 de fevereiro de 2009. Consultado em 24 de novembro de 2010 
  3. ↑ «List of the brighest RV Tauri stars». AAVSO. Consultado em 20 de novembro de 2010  (source article)

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